She could “destroy the Earth and the resulting shockwave would collapse the sun”. Yeah, I think she’s strong enough to get rid of hydroxide groups from carbohydrates simply by the sheer pressure of her hands squeezing an apple.

The formation of a natural diamond requires very specific conditions, like exposure of carbon-bearing materials to high pressure, ranging approximately between 45 and 60 kilobars, but a comparatively low temperature range between approximately 1600-2370F (900-1300C). These conditions are known to be met in two places on Earth: the litospheric mantle below relatively stable continental plates, and at the site of a meteorite impact.

Professor Malcolm McMahon, based at the Centre for Science and Extreme Conditions at Edinburgh University, said that his team of scientists can replicate these extreme conditions, by squeezing organic material between the tips of two diamonds, thus producing a “stiletto heel effect”.

He sustains that huge pressure is all that it takes to transform ordinary elements into new materials, thus proving that the century-old dream of the alchemists is really possible.

Who knew that knocking 3 measly protons off of a lead atom would be so hazardous to one’s health?

As for making diamonds, well, we’ve been doing that for years now… In fact one of the methods uses a process not unlike that which happens during a meteor impact.
Synthetic diamonds are quite common nowadays. So much so that the IGA and other regulatory bodies in the diamond industry have taken to registering natural stones to provide proof of authenticity as well as developing spectroscopic scanning techniques to spot the synthetics.

And by now they have even managed to recreate the flaws in the diamonds that they were looking for with their spectroscopic equipment. As it stands it’s possible to grow synthetic diamonds that can not be distinguished from naturally occurring diamonds, something De Beers really doesn’t want to acknowledge as it threatens their business.

You’re all assuming Bud is being literal about the ultra-compressed object she made in her hands. She probably just means a “stone” created by extreme pressures no human should be able to duplicate, which she knows is similar to how diamonds are created. Thus, for wont of what else to call an ultra-dense former apple (and other similar things she made from likely different objects), she’ll call them “diamonds”.